1 Ultralow Noise BiFET Op Amp AD743 . FEATURES CONNECTION DIAGRAMS. Ultralow Noise Performance 8-Lead PDIP (N) 16-Lead SOIC (R). nV/ Hz at 10 kHz V p-p, Hz to 10 Hz fA/ Hz Current Noise at 1 kHz NULL 1. AD743 8 NC NC 1 8 NC. 16. OFFSET AD743 . IN 2 7 +VS NULL 2 15 NC. Excellent DC Performance mV Max Offset Voltage +IN 3 6 OUT IN 3 14 NC. 250 pA Max Input Bias Current VS 4 NC 4 13 +VS. 5 NULL. 1000 V/mV Min Open-Loop Gain TOP VIEW. +IN 5 12 OUTPUT. NC = NO CONNECT. AC Performance OFFSET. VS 6 11. V/ s Slew Rate NULL. MHz Unity-Gain Bandwidth NC 7 10 NC. THD = @ 1 kHz NC 8 TOP VIEW 9 NC. Available in Tape and Reel in Accordance with NC = NO CONNECT. EIA-481A Standard APPLICATIONS. Sonar Preamplifiers High Dynamic Range Filters (>140 dB). Photodiode and IR Detector Amplifiers 2. The combination of low voltage and low current Noise make Accelerometers the AD743 ideal for charge sensitive applications such as accelerometers and hydrophones.
2 3. The low input offset voltage and low Noise level of the AD743 . GENERAL DESCRIPTION provide >140 dB dynamic range. The AD743 is an Ultralow Noise , precision, FET input, monolithic 4. The typical 10 kHz Noise level of nV/ Hz permits a three operational amplifier. It offers a combination of the Ultralow volt- op amp instrumentation amplifier, using three AD743s, to be age Noise generally associated with bipolar input op amps and built which exhibits less than nV/ Hz Noise at 10 kHz the very low input current of a FET input device. Furthermore, and which has low input bias currents. the AD743 does not exhibit an output phase reversal when the negative common-mode voltage limit is exceeded. 1000. R SOURCE OP27 AND. The AD743 's guaranteed, maximum input voltage Noise of RESISTOR. nV/ Hz at 10 kHz is unsurpassed for a FET input mono- EO ( ). lithic op amp, as is the maximum V p-p, Hz to 10 Hz INPUT VOLTAGE Noise (nV/ Hz). Noise .
3 The AD743 also has excellent dc performance with 250 pA R SOURCE. 100. maximum input bias current and mV maximum offset voltage. The AD743 is specifically designed for use as a preamp in capaci- AD743 AND RESISTOR. AD743 AND. OR. tive sensors, such as ceramic hydrophones. The AD743J is rated OP27 AND RESISTOR RESISTOR. ( ). over the commercial temperature range of 0 C to 70 C. 10. The AD743 is available in a 16-lead SOIC and 8-lead PDIP. PRODUCT HIGHLIGHTS RESISTOR Noise ONLY. ( ). 1. The low offset voltage and low input offset voltage drift of the AD743 coupled with its Ultralow Noise performance mean 1. 100 1k 10k 100k 1M 10M. that the AD743 can be used for upgrading many applications SOURCE RESISTANCE ( ). now using bipolar amplifiers. Figure 1. Input Voltage Noise vs. Source Resistance REV. E. Information furnished by analog devices is believed to be accurate and reliable. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.
4 No license is granted by implication or otherwise One Technology Way, Box 9106, Norwood, MA 02062-9106, under any patent or patent rights of analog devices . Trademarks and Tel: 781/329-4700 registered trademarks are the property of their respective companies. Fax: 781/326-8703 2003 analog devices , Inc. All rights reserved. AD743 * PRODUCT PAGE QUICK LINKS. Last Content Update: 02/23/2017. COMPARABLE PARTS DESIGN RESOURCES. View a parametric search of comparable parts. AD743 Material Declaration PCN-PDN Information DOCUMENTATION Quality And Reliability Application Notes Symbols and Footprints AN-253: Find Op Amp Noise with Spreadsheet AN-358: Noise and Operational Amplifier Circuits DISCUSSIONS. AN-649: Using the analog devices Active Filter Design View all AD743 EngineerZone Discussions. Tool AN-940: Low Noise Amplifier Selection Guide for Optimal SAMPLE AND BUY. Noise Performance Visit the product page to see pricing options.
5 Data Sheet AD743 : Ultralow Noise BiFET Op Amp Data Sheet TECHNICAL SUPPORT. Submit a technical question or find your regional support TOOLS AND SIMULATIONS number. AD743 SPICE Macro-Model DOCUMENT FEEDBACK. Submit feedback for this data Sheet . This page is dynamically generated by analog devices , Inc., and inserted into this data Sheet . A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data Sheet . This dynamic page may be frequently modified. AD743 SPECIFICATIONS (@ 25 C and 15 V dc, unless otherwise noted.). Parameter Conditions Min Typ Max Unit 1. INPUT OFFSET VOLTAGE. Initial Offset mV. Initial Offset TMIN to TMAX mV. vs. Temperature TMIN to TMAX 2 V/ C. vs. Supply (PSRR) 12 V to 18 V2 90 96 dB. vs. Supply (PSRR) TMIN to TMAX 88 dB. INPUT BIAS CURRENT 3. Either Input VCM = 0 V 150 400 pA. Either Input @ TMAX VCM = 0 V nA. Either Input VCM = 10 V 250 600 pA.
6 Either Input, VS = 5 V VCM = 0 V 30 200 pA. INPUT OFFSET CURRENT VCM = 0 V 40 150 pA. Offset Current @ TMAX VCM = 0 V nA. FREQUENCY RESPONSE. Gain BW, Small Signal G = 1 MHz Full Power Response VO = 20 V p-p 25 kHz Slew Rate, Unity Gain G = 1 V/ s Settling Time to 6 s Total Harmonic Distortion4 f = 1 kHz (TPC 16) G = 1 %. INPUT IMPEDANCE. Differential 1 10 10 20 pF. Common Mode 3 10 11 18 pF. INPUT VOLTAGE RANGE. Differential5 20 V. Common-Mode Voltage + , V. Over Maximum Operating Range 6 10 +12 V. Common-Mode Rejection Ratio VCM = 10 V 80 95 dB. TMIN to TMAX 78 dB. INPUT VOLTAGE Noise Hz to 10 Hz V p-p f = 10 Hz nV/ Hz f = 100 Hz nV/ Hz f = 1 kHz nV/ Hz f = 10 kHz nV/ Hz INPUT CURRENT Noise f = 1 kHz fA/ Hz OPEN-LOOP GAIN VO = 10 V, RLOAD 2 k 1000 4000 V/mV. TMIN to TMAX 800 V/mV. RLOAD = 600 1200 V/mV. OUTPUT CHARACTERISTICS. Voltage RLOAD 600 +13, 12 V. RLOAD 600 + , V. TMIN to TMAX +12, 10 V. RLOAD 2 k 12 + , V. Current Short Circuit 20 40 mA.
7 POWER SUPPLY. Rated Performance 15 V. Operating Range 18 V. Quiescent Current mA. TRANSISTOR COUNT No. of Transistors 50. NOTES. 1. Input offset voltage specifications are guaranteed after five minutes of operation at T A = 25 C. 2. Test conditions: +V S = 15 V, VS = 12 V to 18 V; and +V S = 12 V to 18 V, V S = 15 V. 3. Bias current specifications are guaranteed maximum at either input after 5 minutes of operation at T A = 25 C. For higher temperature, the current doubles every 10 C. 4. Gain = 1, R L = 2 k , CL = 10 pF. 5. Defined as voltage between inputs, such that neither exceeds 10 V from common. 6. The AD743 does not exhibit an output phase reversal when the negative common-mode limit is exceeded. All min and max specifications are guaranteed. Specifications subject to change without notice. 2 REV. E. AD743 . ABSOLUTE MAXIMUM RATINGS 1 ORDERING GUIDE. Supply Voltage .. 18 V. Internal Power Dissipation2 Temperature Package Input Voltage.
8 VS Model Range Option*. Output Short Circuit Duration .. Indefinite AD743JN 0 C to 70 C N-8. Differential Input Voltage .. +VS and VS AD743JR-16 0 C to 70 C R-16. Storage Temperature Range (N, R) .. 65 C to +125 C AD743JR-16-REEL 0 C to 70 C Tape and Reel Operating Temperature Range AD743JR-16-REEL7 0 C to 70 C Tape and Reel AD743J .. 0 C to 70 C. *N = PDIP; R = SOIC. Lead Temperature Range (Soldering 60 sec) .. 300 C. NOTES. 1. Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only; and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. 8-lead PDIP: JA = 100 C/W, JC = 30 C/W. 16-lead SOIC: JA = 100 C/W, JC = 30 C/W. ESD SUSCEPTIBILITY. An ESD classification per method of MIL-STD-883C has been performed on the AD743 .
9 The AD743 is a Class 1 device, passing at 1000 V and failing at 1500 V on null Pins 1 and 5, when tested, using an IMCS 5000 automated ESD tester. Pins other than null pins fail at greater than 2500 V. CAUTION. ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD743 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. E 3 . AD743 Typical Performance Characteristics (@ 25 C, VS = 15 V). 20 20 35. RLOAD = 10k RLOAD = 10k . OUTPUT VOLTAGE SWING (V p-p). 30. OUTPUT VOLTAGE SWING (V). INPUT VOLTAGE SWING (V). POSITIVE. 15 15. SUPPLY 25. +VIN. 20. 10 10. 15. VIN NEGATIVE. SUPPLY 10. 5 50. 5. 0 0 0.
10 0 5 10 15 20 0 5 10 15 20 10 100 1k 10k SUPPLY VOLTAGE ( V) SUPPLY VOLTAGE ( V). LOAD RESISTANCE ( ). TPC 1. Input Voltage Swing vs. TPC 2. Output Voltage Swing TPC 3. Output Voltage Swing Supply Voltage vs. Supply Voltage vs. Load Resistance 12 10 6 200. 100. 10 7. QUIESCENT CURRENT (mA). OUTPUT IMPEDANCE ( ). INPUT BIAS CURRENT (A). 9. 10. 10 8. 6 10 9 1. 10 10. 3 10 11. 0 10 12 0 5 10 15 20 60 40 20 0 20 40 60 80 100 120 140 10k 100k 1M 10M 100M. SUPPLY VOLTAGE ( V) TEMPERATURE ( C) FREQUENCY (Hz). TPC 4. Quiescent Current vs. TPC 5. Input Bias Current vs. TPC 6. Output Impedance vs. Supply Voltage Temperature Frequency (Closed-Loop Gain = 1). 300 80 GAIN BANDWIDTH PRODUCT (MHz). 70. INPUT BIAS CURRENT (pA). 60 + OUTPUT. CURRENT LIMIT (mA). 200 CURRENT. 50. 40. 30 OUTPUT. 100. CURRENT. 20. 10. 0 0 12 9 6 3 0 3 6 9 12. 60 40 20 0 20 40 60 80 100 120 140 60 40 20 0 20 40 60 80 100 120 140. COMMON-MODE VOLTAGE (V) TEMPERATURE ( C) TEMPERATURE ( C).